Indie musician Ted Leo of Ted Leo and the Pharmacists has been a vegetarian since 1988 and vegan since 1998.

Indie musician Ted Leo of Ted Leo and the Pharmacists has been a vegetarian since 1988 and vegan since 1998.

Photo: Cory Schwartz, Getty Images

Indie musician Ted Leo of Ted Leo and the Pharmacists has been a... Photo-5553216.75372 - San Antonio Express-News

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After being diagnosed with the autoimmune disease Sjogren's Syndrome, professional tennis player Venus Williams switched to a raw, vegan diet. Her sister Serena Williams switched as well, for moral support.

After being diagnosed with the autoimmune disease Sjogren's Syndrome, professional tennis player Venus Williams switched to a raw, vegan diet. Her sister Serena Williams switched as well, for moral support.

Photo: Alberto E. Rodriguez, Getty Images

After being diagnosed with the autoimmune disease Sjogren's... Photo-5553218.75372 - San Antonio Express-News

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Weird Al Yankovic has been a vegetarian (and sometimes vegan) since the 1990s.

Weird Al Yankovic has been a vegetarian (and sometimes vegan) since the 1990s.